Yes and no. Aftermarket BBK caliper kits have different bolt holes and use a bracket to allow them to bolt up. The big difference between the GS and Supra/SC is the location of the tie rod end. On the GS the tie rod end is behind the wheel under the brake caliper towards the firewall where on the Supra/SC it is in front of the wheel. This gives the Supra/SC more room for bigger brakes since there isn't a tie rod end in the way. So the answer is yes it could fit but it might also hit your tie rod in which case you can't use them.

 

I have a 03 GS430 and I am planning to put TT brakes in front but not bent the dust shield or take it off completely. I just curious if I can buy the TT dust shield in put it on. Has anyone gone that route instead of bending or taking off the dust GS dust shield?

 

No, the Supra brake dust shield will not fit in a GS judging from their designs

Supra brake dust shield

GS300 brake dust shield

 

Also to take the dust shield off you will need to remove the hub. The hole is not large enough to fit over the hub and there is no slot to remove as you can see in the pictures. I had the same idea but its just not worth it so I cut my shield

 

It's not worth doing that extra work to remove the dust shield. I just cut mine and grind the edges to make it smoother. Just make sure you bleed properly and I'm just gonna say, this should be the very first upgrade anyone should do when owning a 2GS.